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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8bdb8280f03e1da45554f59d8a5f5cd7075e47c8eaccd4de0d261dde0bb449c' 
  AND token = '1lJzoe700pvm8V4qAN83ydxCOd9ZtXC21Z7LjF+sRnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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