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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8c11db034e4d4c6d1fa9f2ddd1b24600d05af6de4f39f481954364573599465' 
  AND token = 'z40E12yp1HKseJ8UqeiDt0FYwUgu0GbIuRUpqsGs5XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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