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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '562a11117cd3d834174c9e185cabd93137c1b32d78ab632a7c528c0b2f9c2917' 
  AND token = 'd2OFrJZB/XbHIENGjAb0pSuLV1LI6iQUSaKe+s57Hug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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