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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16dccb81c4430d38daa3a1efbf7a20bd2e91fdaca52a785fb995d9898ee03ce8' 
  AND token = '45DmvmJlnHe7wiMvXJgnISq7VFCHiS0dU/weYNFthSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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