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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c44e93ad299908d0af7e326e2e67f61840d7b9bc4e726086422b24f55befeb' 
  AND token = 'hV7PW+AtbVdXZknYV7cFfHxPOHkxKeMVsXbJjhnrqeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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