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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '877f93ac5a94c966424ab770ec77b84fed342b6afa3cd62c437a4fb09d6d3de5' 
  AND token = '03o6vNVhcdIK6fiD7n7PsxhK9BfIH5yuu4PYvXfCPjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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