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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c894556959e6bf9ba5f68cc6fc3013fd588ad89ce2fe09bf5f5d4bc6ba23baa' 
  AND token = 'x64vjlRl7epiucybj3FdcT+/grm5zSvb8xxln5Mz4ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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