SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdb726d9e1bc32f9d9024d16318ef1379b098d112f8008d0187879a445b5bc8b' 
  AND token = 'kBwZWFeVKqwRPJzUiE6HH2oY+jLD2Mbjjs0PCzxE7qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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