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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c2c8f4d629c3a03070af1eed65972329844e73c2ebb8376dd5769c35ab52598' 
  AND token = '6bYTcQjGg2Og4e9/NGGlQTZeGfsBzUoloeu9ViO8pFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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