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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '360774d202b2d7f168b73e18e9b622c610c45ebc5e3e313424bd5e88e33d1a94' 
  AND token = 'I1a7mzE3V4i2A+hyIVn9DB0HZ3uSIuSAy9NZvp3IPRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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