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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72fd05c648899e543fcd30ca663b4bccc47c3b5858f0e992090f80fcb77739aa' 
  AND token = '8NeUmLYq6hxbihX9dHV6ueiDj05fu5zkE8alGJlAXz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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