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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0a8ac261670d6a12600a4b6a41cb7205874194fe094fee771e65914a9d6a7b8' 
  AND token = 'kogtuA0+mi8Xbt9hUhGmCIdMZFvx8Zqi+gUwLcpvuc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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