SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58146f09e2f21c155bd9aeaf57b873ba569886495a8a1a232a43a40129ecb9ac' 
  AND token = '7Jg4/eVfj/VfVDhoHSNFJ+uEJ/hpMCMLa84hnrjOXKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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