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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b91948f8c7c0a4327b912c7925a043dc41048914eedf7c18506d55f78ae4f03' 
  AND token = '5fZMUF2ZmUl6623j+/FbmDH0GNbArUjA+l5YALf1+A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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