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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c7141bebfcd71f50fc1cbada3bbb6fb20dc4d50d5e200346b2ae136a414c974' 
  AND token = 'zpdgkGIdABG+mk9X+cv9qz9S/plQXSkNFyDmsrddrtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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