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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17a464e44a6d8600b9b84406fb5c7fba1721d1e1a4d218b430e01e10b0075d94' 
  AND token = 'eQ9MUVPcmyZGtacchuyvR1fw4WiIughR2yRgJr3nnhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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