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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fba6e19eb3960760b17a1da17b5db722a1db3c63b6d3a850c414c493f4ca238' 
  AND token = 'niJ9gEQKrsIE7909RsLvvtmtrNmvovXga65NJRrejc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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