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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69a029689407f193ad4fdbd4a5e58bad0387d94ce89365388f1b8fd41616a489' 
  AND token = '2knfNgqdR9mBAKNb2mUKjT6Z8pEuy5biHmizhCScN9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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