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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf5720065f3526bd400ec1d1e04daa8e66e6869a4754976178bfd1f579f63f15' 
  AND token = 'DNINRsqWi0wVRUdIAzXTkM37mgJ9xIIF2fmK68i793o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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