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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ecf30319df6ff96af72da0c4b15a31b718293327ab65343b45171773784f8f3' 
  AND token = 'nwoySlRce0jEb4Kp97y3LqYlN5ZR4Y/EXl21Zj4zBQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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