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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52e7c2fa0aa8984beac6d61667bf4708251d92b6fe2fd8a0e8a3288756505461' 
  AND token = 'i2iHXWfzch/HI3BFI99Bg9gxqe9mr7k2dwUwyG4wluk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}