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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '080b3901643f87eefaae864453ecc6a312a044c3b77332b015581684c5d89ccf' 
  AND token = '3CuWbj4i33DvObGQfWiOqDCVDr7imeMdZxauJGs5oH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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