SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0da0b945f77aeeb9f9b438d541b5544392fc2e2308921aa0a290af187644d767' 
  AND token = 'QKIBN/euGYnEBfe6jgrKbe8QtzeIvygJPubE6JmQv8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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