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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc82d7460c6dc5ad5bef7c43d072fe69d7fd07c2c09918b583965e2f082b591c' 
  AND token = 'qhKO243gFpUegvr5RuJ8vNHf0qr5aNUCp6FFJKsv7uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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