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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1fda86821c27860d9e07112a96f89d88631e03f84223d2be7d7469ef2d6e9f5' 
  AND token = '9KvJ+gGxMDt+lybiEN7v3pKCmbcIkaAobAXzz5cWeDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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