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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cccd322ccc1828fc6f01280decf08a6d38919cb6d51f48d42b6fadf6515a4ba' 
  AND token = 'OqECHeVP7Bfzc2lWBJCjVa2kBMelXtZc0a3kMuoEAu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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