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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5bf3cd7e8db47786d386cd4f740c7b1340edcee2bc8a4237c79e1a6a4eeff5f' 
  AND token = '+VILf+257vaJS6p7WT82ZCIofYI/Z2feHslvHRDuOAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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