SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68b92fb488f501611c9cdbbe55d4cdaa5ec59bdfa2165ae6bc444cf172f9c22b' 
  AND token = 'ghdxx8pXNbPPjLzwvCA1mhN3zun0fZZej+gnxilJYO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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