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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ba6006f5cbbd21c80fcb9d727c9954d734c6b58c733604886bce493d20f84c8' 
  AND token = 'l6W0j7eRC08T257nbobob3XBFuz5u3GZU0Xihww3r2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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