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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628c67d98e28e0518797849f7210953c4a49cab1b235cfad6d8d26f66370ceaf' 
  AND token = 'd4ewPWUKaHEzSv6ANWuxutSYzhOnJA1sPqa29fICAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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