SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3149ff742b2ca85673fa316459669debc238cd15a5d3ed2480ec24659340cec8' 
  AND token = 'vFJvkEOYmbtQnDaslz6gIsiQ+ciWYpOhLeiXoTIxKlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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