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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71d7087a19d08c71d0d0888e2104a95fb4285f358c610fd0bbf3467b87373cea' 
  AND token = 'sW7tdqYitn3w/8jO3GONRAm/Kmd4foPLXw3vfZRocbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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