SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cd591611354b8b6c438281ed2940444fe04630a787568a99bc163352f492f58' 
  AND token = 'tLhEUAREuvTOnCZ8vzsmTk19GHTXxPwEWiNzFPL1DEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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