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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5dbda5d4e7a8d4a881a9de5db6f180f6f5681f68c8997c1ebe56ba964c150d1' 
  AND token = 'YXQcVouxDuQONII7N6AfUPaXjYSYoDD80ddRAFda2Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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