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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b28bcad8cad0af525eea03548f0e9311c3a4d587b8513923c14afc66a0fb284' 
  AND token = 'Sd0aaCMZy2RKeb6UBBgGUbrZyKmbvz/DU/MJvTC/CGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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