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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4dd30bab7ff743c4b867483fe9d6948c36e5b5ee2aa33fa0fe117bb20b12046' 
  AND token = 'aapelinAzweGMQTouxI5cEzPoSdK3rDja0gVwY89y9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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