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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '432184b72ad0cbf0458464a4033308c65c431e80512c142ae9f6208b218861d4' 
  AND token = 'PrNd0kJxrIVKKOmt4tQBVVfokt7X3LtxLXcPXJJIqTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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