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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f03a76ff70c3900b7bd11e595d73b11f6a475051541bf6f527494c7b1fa84cc' 
  AND token = 'PY6Mstd2N7rqDEfFjPWi5YDCGUrgOSeAT4b5orlGBz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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