SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e233c7f700377eed1c58a57f00bb36a0591856814de494258e435face4612ba9' 
  AND token = '7EYlDPfuQFLq6W3nKt0MSvuE8NCK4PbKq8B+JwIA3qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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