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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c5549734a4abd7349e0530ebfefbe5da14ada17868c34ec681d3b8a6f815b7' 
  AND token = 'DR/Vu1vEez7gt+lPt13Vq9L6KtTSWkNkM4c1N+FtMKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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