SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c96ac46c1c2f23aa93b8f5a4653e786fcda79edcd4cc0bcb68ae73993928d90e' 
  AND token = 'wPyf/GjnB7s1HLs0kADiaZ7gZIHqqPEyCxY7CGThD8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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