SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f29579a05ebe68119d2f8d439c24bbc14655c536bde2a2ff1d417d5b4f6b6e2' 
  AND token = 'UT4cZKIzELa7HnwwieXt20FgU/3YmG1a6zljIgYyJS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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