SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b3426f5a39a44c8bdaf40b100b084106a9156ed7e9bfa25c85b93f8bf9c13e' 
  AND token = 'li/sz+UjLR7wmuih7ek5ujQxvDPHO4D7r2GZcKI3W+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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