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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e44dabeb9a79051194054a3ad9f9d91b878eef5a334cf8d8f11b8a99ed2156d' 
  AND token = '14d2gwciQrqLqX83+kOx4BWFZGDBuqjdijoQpY4luGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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