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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83f1ca9936a9d9cb89a66be394d16e28f66ef1e53ad3eb9b9d830b6be3c87492' 
  AND token = 'V+kERPL1OrjugPZvnhJdu/9cQO7ZyVF2vgkNNtnBbgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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