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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba939c0fdc730aae0dff6ad52ae668faebcc7377745e60d91b470e008dfc6b27' 
  AND token = 'dzFNjpkruxTAybluEFPM4y5IyF5dwkDpT/JELTaWHNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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