SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '594df7e1dbe7fafa48032a8b8937d8aff4480431bd4c96b8867b8b228e0a579c' 
  AND token = 'IV2YDnyLuuPMGwzST0ZOgkm9FcoHqK3wosHCVuPL2lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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