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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0924f4a6c21c450d91451adb8b48436a56ef6698bf82ed2e128ec1a2410b57e' 
  AND token = 'jLlsFIwswwPkZO8SGxikrskEL5vA3gSPT9woEtS/ICk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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