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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ac4afc2403ea5ae1a3e0e565d6a5a39e66391e6987ea28563fc6adf7d38f6cb' 
  AND token = 'HFQqECdaQL4uc+JxL/eQw387zOiKHPr75V/WqC5uoXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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