SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d845052261b650ce80429b5656325fe5342078991fddee5ceb19f8250f708ac' 
  AND token = 'Pg13prus7Iluuay1R/wv4ESwzDhQ/NdHfJd1tqYXVYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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