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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab2846a2838a72f524d0f06fc197fbef884761b24fdbf3a0d0e2aa588c946657' 
  AND token = 'XPHOxL8krJ5dLOk9G0HNR9mv2aSY7P4Za1NTqXwFEvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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