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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33f1f0726e6531bd8d6dae76c245c065d18f323df6e2fb8c0aedab550b17ec8c' 
  AND token = 'ZHN9iGxf7Q5EoTTgtJSM/t4M1N5tulmivGuOHBlr1Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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