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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa347c1021d2d08ab6995d6897753bd9a73c2908750949b8a2355d324f1736aa' 
  AND token = 'T9FZ7AhQ7t7YmzK1Qbs0XFrbawXy+yHjAwXXzFodOfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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