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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd019e25d58bc74b0dd2b5fc88bdc9a1c6fa014f0b96706e8c23866bf777d1bff' 
  AND token = 'm+D8U5PeYCiEhOO8VFpW6HqGv8IbTNH35AiD1Cb+8VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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