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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64dab7e9cfefe8329f00804c51b9e54df77652e29d0ebeef3371511893c2480b' 
  AND token = '8qr7yP3rDPK1KqV9GCwCi7lJaZuoTu3tmV7ram8UX6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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