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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7450ae187e87ea1f252871c8e6201550246490751ac5abf34e5c232566551bfc' 
  AND token = 'ATeKSkDwkB5BP4OmCn3JGnFvYzyW8C8amVkonyE0EeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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