SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa849858ca610b55c403e8f1d209f6c4ea503966ae25291fa754d75fd2d036a3' 
  AND token = 'Ax+4Ff3rEuW4xbV97x/1HNEMlYGOdwvnBz7N3FoJ8WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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