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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41f230da1c33f7dad3ca1abbcca7be054c83259f623b7f1a4d67f247fa75955c' 
  AND token = 'KUtTzFMP8S9vFiuQwM+zKpE5bwTtOJHppCUoERE5oSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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