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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44c4260cf30ffe736318cea58fa14fc2f81ebeb2f31d83875d9ad7ad97fff1ee' 
  AND token = '//Gsnl6FxW24pWAYm6fcROpasJy6eckTuy+2obSIZGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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