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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '431e13edff838fa9210012d823ab042cdd89f13e3cd9115cf9b68364b60829ba' 
  AND token = 'SZm2jRoayArwOrzuA9Rg/QclX0t661eEQpFALnvmX0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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