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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c587d3207e9d3d75e7b3ffa0ab575a36a76dc7039d481eda08f02b2cbafcb8fd' 
  AND token = 'Yw4t/AYDBa3VtydWmVTX/aAbLhEbqYVmElgAhf0chjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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