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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83509e9ea0cea0ab4d3896bdec689c61be76558f1bce76f581616912b5d1ee0b' 
  AND token = 'rAKVoMqZKW3ViXczPdWK9jpNs7feNYDOk40m2ZBELxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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