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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28edc9714021989b1e63ba4873a69c86c13523cb5bdad34308984b439198a094' 
  AND token = 'EmnvBtF/SwIgLkj7DRBomBgMvK8mAb4NWnl0Gu1NILw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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