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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f216501dd9d805346205b98917ca83d842561732cb20914a708e2a5433b2c59' 
  AND token = 'Ur3TThXugWH09cMTE/kSOYDfD0LT4cAXaiPwOUMYYYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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